I have had the same problem.
You may be reducing the diameter of every bullet you seat. I don't care what size it is.
Seating dies can all swage down the diameter when it pushes the lead boolit into the case. You spend time and money getting a correct size boolit only to shrink it during seating. Bad.
The answer is to get the M style cowboy dies from RCBS or Redding. Then call for a new stem sized correctly to .431. They will do it for free.
The M style creates a "nest" that will accept the boolit without swaging it down.
Prescut
Also, large rifle primers may not be helping the unburnt granules. Back off the powder a little and try using large pistol magnums. That will help. Slow powders like H110, 296, 4227 absolutely demand it.
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